US7018412B2 - Allograft spinal implant - Google Patents
Allograft spinal implant Download PDFInfo
- Publication number
- US7018412B2 US7018412B2 US10/225,090 US22509002A US7018412B2 US 7018412 B2 US7018412 B2 US 7018412B2 US 22509002 A US22509002 A US 22509002A US 7018412 B2 US7018412 B2 US 7018412B2
- Authority
- US
- United States
- Prior art keywords
- face
- generally
- spinal implant
- superior
- inferior
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000007943 implant Substances 0.000 title claims abstract description 145
- 125000006850 spacer group Chemical group 0.000 claims description 24
- 230000000087 stabilizing effect Effects 0.000 description 19
- 230000004927 fusion Effects 0.000 description 15
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- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000003306 harvesting Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
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- 230000000116 mitigating effect Effects 0.000 description 2
- 210000005036 nerve Anatomy 0.000 description 2
- 230000000399 orthopedic effect Effects 0.000 description 2
- 210000000278 spinal cord Anatomy 0.000 description 2
- 238000001356 surgical procedure Methods 0.000 description 2
- 208000008035 Back Pain Diseases 0.000 description 1
- 206010010356 Congenital anomaly Diseases 0.000 description 1
- 206010061246 Intervertebral disc degeneration Diseases 0.000 description 1
- 208000002193 Pain Diseases 0.000 description 1
- 239000012620 biological material Substances 0.000 description 1
- 230000001684 chronic effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 210000005257 cortical tissue Anatomy 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
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- 210000004705 lumbosacral region Anatomy 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 230000000278 osteoconductive effect Effects 0.000 description 1
- 230000002138 osteoinductive effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 210000000273 spinal nerve root Anatomy 0.000 description 1
- 210000002303 tibia Anatomy 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
- 210000000689 upper leg Anatomy 0.000 description 1
Images
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0004—Rounded shapes, e.g. with rounded corners
- A61F2230/0015—Kidney-shaped, e.g. bean-shaped
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0069—Three-dimensional shapes cylindrical
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S606/00—Surgery
- Y10S606/907—Composed of particular material or coated
- Y10S606/909—Bone
Definitions
- the present invention generally pertains to orthopedic surgical procedures, and more particularly to an allograft spinal implant.
- Interbody fusion involves reestablishment of the normal gap between adjacent vertebral bodies.
- surgeons have employed various types of artificial implants and prostheses to stabilize the spinal column and promote fusion.
- the gap between adjacent vertebral bodies is commonly spanned with rigid spacer that is filled with bone graft material to facilitate bony fusion of the two vertebral bodies.
- a successful fusion stabilizes the spine, reduces pressure on the spinal cord and nerve roots, and reduces or eliminates back pain.
- Cloward dowels are circular grafts made from autologous illiac crest bone.
- the dowels are bicortical, having porous cancellous bone between two cortical surfaces.
- a cylindrical cutting tool is typically used to prepare the cervical site to receive the dowel.
- fibular and humeral cortical rings have been used as interbody spacers for spinal fusions such as anterior cervical fusions.
- tissue banks conventionally offer pre-shaped allograft cortical rings for this purpose.
- an allograft spinal implant is provided which resists migration and retropulsion from proper positioning within the spinal column.
- a particular advantage of the present invention is to provide an allograft spinal implant which enhances bone fusion and resist migration or retropulsion in all directions in the plane of the vertebral body end plate/implant interfaces.
- a related advantage of the present invention is to provide an allograft spinal implant having concentric circular ridges that resist migration or retropulsion.
- a more particular advantage of the present invention is to provide an allograft spinal implant having concentric circular ridges with a common center positioned approximately at the centroid of a saggital section of a cortical shaft.
- Another advantage of the present invention is to provide an allograft spinal implant having stabilizing fins that extend in superior and inferior directions.
- Another advantage of the present invention is to provide an allograft spinal implant having one or more stabilizing fins that engage cooperating grooves in adjacent vertebrae extending in an anterior/posterior direction.
- the present invention provides an allograft spinal implant including a generally planar superior end face, a generally planar inferior end face and a generally cylindrical sidewall.
- the generally cylindrical sidewall extends between the superior end face and the inferior end face. At least one of the superior end face and the inferior end face includes a plurality of concentric circular ridges.
- the present invention provides an allograft spinal implant including a main body portion and at least one stabilizing fin.
- the main body portion includes a generally planar superior surface and a generally planar inferior surface.
- the at least one stabilizing fin extends from one of the superior surface and the inferior surface.
- the present invention provides a method of stabilizing a spinal column.
- the method includes the step of providing a spinal implant having a main body portion with a generally planar superior surface and a generally planar inferior surface.
- the spinal implant further includes at least one stabilizing fin extending from one of the superior and inferior surfaces.
- the method additionally includes the step of disposing the spinal implant between a pair of adjacent vertebrae of the spinal column to establish a normal gap therebetween. Further, the method includes the step of engaging the at least one stabilizing fin in a corresponding groove formed in one of the pair of adjacent vertebrae.
- FIG. 1 is a perspective view illustrating an allograft spinal implant constructed in accordance with the teachings of a first preferred embodiment of the present invention.
- FIG. 2 is an inferior end view of the allograft spinal implant constructed according to the teachings of the first preferred embodiment of the present invention.
- FIG. 3 is a cross-sectional view taken along the line 3 — 3 of FIG. 2 .
- FIG. 4 is an environmental view illustrating a first general step for harvesting allograft spinal implants according to the teachings of the first preferred embodiment of the present invention.
- FIG. 5 is a simplified lateral side view illustrating an allograft spinal implant constructed according to the teachings of a second preferred embodiment of the present invention.
- FIG. 6 is an inferior end view of an allograft spinal implant constructed according to the teachings of a third preferred embodiment of the present invention.
- FIG. 7 is a perspective view of the allograft spinal implant constructed according to the teachings of the third preferred embodiment of the present invention.
- FIG. 8 is an inferior end view of an allograft spinal implant constructed according to the teachings of a fourth preferred embodiment of the present invention.
- FIG. 9 is a perspective view of the allograft spinal implant constructed according to the teachings of the fourth preferred embodiment of the present invention.
- FIG. 10 is an exploded side view of an allograft spinal implant constructed according to the teachings of a fifth preferred embodiment of the present invention.
- FIGS. 11 and 12 are exploded perspective views of the allograft spinal implant constructed according to the teachings of the fifth preferred embodiment of the present invention.
- FIG. 13 is a perspective view of an allograft spinal implant constructed according to the teachings of a sixth preferred embodiment of the present invention.
- FIG. 14 is a side view of an allograft spinal implant constructed according to the teachings of the sixth preferred embodiment of the present invention.
- FIG. 15 is a superior end view of the allograft spinal implant constructed according to the teachings of the sixth preferred embodiment of the present invention.
- FIG. 16 is a cross-sectional view taken along the line 16 — 16 of FIG. 14 .
- FIG. 17 is a perspective view of an allograft spinal implant constructed according to the teachings of a seventh preferred embodiment of the present invention.
- FIG. 18 is a side view of an allograft spinal implant constructed according to the teachings of the seventh preferred embodiment of the present invention.
- FIG. 19 is a superior view of the allograft spinal implant constructed according to the teachings of the seventh preferred embodiment of the present invention.
- FIG. 20 is a cross-sectional view taken along the line 20 — 20 of FIG. 18 .
- FIGS. 21–24 are various perspective views of the allograft spinal implant constructed according to the teachings of a eighth preferred embodiment of the present invention.
- FIGS. 25–28 illustrate the manufacturing process for the allograft spinal implant according to the teachings of the eighth preferred embodiment of the present invention.
- FIG. 29 is a simplified posterior side view of the allograft spinal implant according to the teachings of the eighth preferred embodiment of the present invention.
- FIG. 30 is a simplified lateral side view of the allograft spinal implant according to the teachings of the eighth preferred embodiment of the present invention.
- FIG. 31 is a simplified posterior view illustrating a pair of allograft spinal implants according to the teachings of the eighth preferred embodiment shown operatively positioned between a pair of adjacent vertebrae.
- FIG. 32 is a simplified lateral view illustrating the allograft spinal implant according to the teachings of the eighth preferred embodiment shown operatively positioned between the pair of vertebrae.
- FIG. 33 is a simplified posterior side view of the allograft spinal implant according to the teachings of a ninth preferred embodiment of the present invention.
- FIG. 34 is a simplified lateral side view of the allograft spinal implant according to the teachings of the ninth preferred embodiment of the present invention.
- FIG. 35 is a simplified posterior view illustrating a pair of allograft spinal implants according to the teachings of the ninth preferred embodiment shown operatively positioned between a pair of adjacent vertebrae.
- FIG. 36 is a simplified lateral view illustrating the allograft spinal implant according to the teachings of the ninth preferred embodiment shown operatively positioned between the pair of vertebrae.
- FIG. 37 is a perspective view of the allograft spinal implant constructed according to the teachings of a tenth preferred embodiment of the present invention.
- FIG. 38 is a side view of an allograft spinal implant constructed according to the teachings of the tenth preferred embodiment of the present invention.
- FIG. 39 is a superior end view of the allograft spinal implant constructed according to the teachings of the tenth preferred embodiment of the present invention.
- FIG. 40 is a cross-sectional view taken along the line 40 — 40 of FIG. 38 .
- FIG. 41 is a perspective view of the allograft spinal implant constructed according to the teachings of an eleventh preferred embodiment of the present invention.
- FIG. 42 is a side view of an allograft spinal implant constructed according to the teachings of the eleventh preferred embodiment of the present invention.
- FIG. 43 is a superior end view of the allograft spinal implant constructed according to the teachings of the eleventh preferred embodiment of the present invention.
- FIG. 44 is a cross-sectional view taken along the line 44 — 44 of FIG. 42 .
- FIG. 45 is a perspective view of the allograft spinal implant constructed according to the teachings of a twelfth preferred embodiment of the present invention.
- FIG. 46 is a side view of an allograft spinal implant constructed according to the teachings of the twelfth preferred embodiment of the present invention.
- FIG. 47 is a superior end view of the allograft spinal implant constructed according to the teachings of the twelfth preferred embodiment of the present invention.
- FIG. 48 is a cross-sectional view taken along the line 48 — 48 of FIG. 47 .
- an allograft spinal implant constructed in accordance with the teachings of a first preferred embodiment of the present invention is illustrated and generally identified at reference character 10 .
- the spinal implant 10 of the first preferred embodiment of the present invention is particularly intended for cervical spine applications.
- teachings of the present invention are equally applicable for fusing other segments of the spinal column.
- the spinal implant 10 has a generally cylindrical shape having a generally planar and circular superior end 12 , a generally planar and circular inferior end 14 and a generally cylindrical sidewall 16 .
- the spinal implant 10 is harvested from a cortical shaft 18 with a power driven hole cutter 20 (see FIG. 4 ).
- the hole cutter generates rough cylinders of cortical tissue.
- the rough cylinders have concave and convex surfaces on the periosteal and endosteal surfaces, respectively, which are trimmed to so as to provide substantially planar and parallel ends 12 and 14 for abutting the end plates of adjacent vertebrae.
- dashed arrows represent various points along the cortical shaft suitable for the harvesting of spinal implant 10 .
- the spinal implant 10 includes a centrally disposed and cylindrical shaped through hole 22 .
- the through hole 22 can be packed with porous osteoconductive or osteoinductive graft material to promote bony through-growth and fusion.
- the ends 12 and 14 of the spinal implant 10 are formed to include a plurality of ridges particularly configured to prevent mitigation and retropulsion of the implant 10 .
- the ridges 24 are prominent concentric-arc ridges 24 having a common center at the center of the through hole 22 .
- the ridges 24 are applied to the implant 10 with a concentric-arc ridge cutter.
- the implant 10 has an outer diameter D, a through hole diameter d and a height H.
- the outer diameter or depth D ranges from approximately 8 mm to approximately 15 mm and the height H ranges from approximately 5 mm to 14 mm.
- the diameter d of the through hole ranges from 0 mm, in which a through hole is not included, to approximately 6 mm.
- a simplified lateral side view of an allograft spinal implant constructed according to the teachings of a second preferred embodiment of the present invention is generally identified at reference numeral 30 .
- the implant is particularly intended for cervical spine applications.
- the implant 30 of the second preferred embodiment will be understood to be identical to the spinal implant 10 of the first preferred embodiment with the exception that superior and inferior end faces 32 and 34 of the implant 30 are not parallel to one another but relatively angled to accommodate natural spinal lordosis.
- the superior and inferior end faces 32 and 34 are angled from one another at approximately 5°. However, it is anticipated that the lordodic angle may fall within the range of 0° to approximately 10° or greater.
- the implant 30 includes an anterior height h 1 , a posterior height h 2 , an outer diameter or depth D, and a through hole 36 having a diameter d.
- the through hole diameter d of the implant 30 preferably ranges from 0 mm to approximately 6 mm and the overall diameter or depth D preferably ranges from approximately 8 mm to approximately 15 mm.
- the anterior height preferably ranges from approximately 8 mm to approximately 14 mm and the posterior height ranges from approximately 5 mm to approximately 11 mm.
- an allograft spinal implant constructed according to the teachings of a third preferred embodiment of the present invention is generally identified at reference character 40 .
- Implant 40 is similar to spinal implant 10 of the first preferred embodiment except that the superior and inferior end faces 42 and 44 incorporate an alternate ridge design.
- the illustrated ridge design includes first and second pluralities of ridges 46 and 48 having common centers on radially opposing sides of the implant 40 .
- an allograft spinal implant constructed in accordance with the teachings of a fourth preferred embodiment of the present invention is illustrated and generally identified at reference number 50 .
- the implant 50 again includes first and second pluralities of ridges 52 and 54 .
- the first and second pluralities of ridges 52 and 54 have common centers adjacent radially opposite sides of the implant 50 .
- the implant 50 is further formed to include a pair of radially opposed notches 56 which can be grasped by an insertion tool (not shown) to facilitate implantation.
- an allograft spinal implant constructed in accordance with the teachings of a fifth preferred embodiment of the present invention is illustrated and generally identified at reference character 60 .
- the implant 60 includes a two-part construction having an upper or superior component 62 and a lower or inferior component 64 .
- the two-part design allows for a greater variety of finished implant sizes from a given donor skeleton.
- the two-part design can be made from layers of cortical shafts with thinner cortical walls than allowable with a single cylindrical design thereby qualifying more weight-bearing donors for fabrication.
- the implant 60 includes substantially parallel end faces 66 and 68 .
- the end faces 66 and 68 are shown to include a ridge pattern for resisting mitigation and retropulsion of the implant 60 substantially identical to that of the implant 50 of the fourth preferred embodiment.
- the implant 60 includes radially opposed notches 70 .
- the implant 60 can be formed with angled end faces 66 and 68 to accommodate natural lordosis, alternate ridge patterns and without any notches 70 .
- the lower component 64 is shown to include an upwardly extending male portion 72 of reduced diameter.
- the male portion 72 is received in a press-fit within a cylindrical aperture 74 defined by the upper component 62 .
- a cervical allograft spinal implant constructed in accordance with the teachings of a sixth preferred embodiment of the present invention is illustrated and generally identified at reference character 75 .
- the longitudinal axis of the donor bone is illustrated at arrow A.
- the implant 75 is illustrated to include a plurality of concentric-arc ridges 24 having a common center on both the inferior and superior surfaces. Distinct from the first embodiment, the implant 75 is only partially circular and is formed to include a plurality of through holes 77 extending from the inferior surface to the superior surface.
- a cervical allograft spinal implant constructed in accordance with the teachings of a seventh preferred embodiment of the present invention is illustrated and generally identified at reference character 80 .
- the implant 80 of the seventh preferred embodiment will be understood to be similar to the spinal implant 75 of the sixth preferred embodiment with the exception that superior and inferior end faces and of the implant 80 are not parallel to one another but relatively angled to accommodate natural spinal lordosis.
- the superior and inferior end faces 30 and 32 are angled from one another at approximately 9°. However, it is anticipated that the lordodic angle may fall within the range of 0° to approximately 9° or greater.
- an allograft spinal implant constructed according to the teachings of an eighth preferred embodiment of the present invention is illustrated and generally identified at reference character 110 .
- the implant 110 of the first preferred embodiment of the present invention is preferably fabricated from a diaphyseal shaft of a human tibia or femur.
- the spinal implant 110 is intended for posterior lumbar interbody spinal fusion applications.
- certain teachings of the present invention are equally applicable for anterior lumbar spine fusion applications or fusing other segments of the spinal column.
- the implant 110 includes a main body portion 112 including a generally planar superior surface 114 and a generally planar inferior surface 116 .
- the main body portion is preferably at least partially ring-shaped.
- the main body portion 112 is half ring-shaped.
- the superior and inferior surfaces 114 and 116 are angled relative to one another at approximately 5°. Alternatively, it will be understood that the superior and inferior surfaces 114 and 116 may be parallel to one another or angled to a greater or lesser degree.
- Each of the superior and inferior surfaces 114 and 116 is shown to preferably include a ridge pattern 118 to prevent retropulsion and migration of the implant 110 .
- the implant 110 further includes at least one stabilizing fin 120 extending from at least one of the superior and inferior surfaces 114 and 116 .
- the implant 180 includes a first stabilizing fin 120 upwardly extending from the superior surface 114 and a second stabilizing fin 120 downwardly extending from the inferior surface 116 .
- the stabilizing fins 120 are shown to be elongated in an anterior/posterior direction and preferably lie in a common plane.
- a rough implant 121 is harvested from a transverse section of cortical bone.
- the rough implant 121 includes a through hole 122 that is naturally formed in the bone by the intramedullary canal.
- the rough implant 121 is sawed so as to create a half ring shaped.
- a third step is shown in which the rough implant 121 is milled so as to define the superior end face 114 , the inferior end face 116 and the stabilizing fins 120 .
- the superior and inferior end faces 114 and 116 are disposed at a lordodic angle of approximately 6°. Alternatively, these surfaces may be formed so as to be parallel or angled to a greater or lesser degree.
- the superior and inferior surfaces of the stabilizing fins 120 are shown to be generally parallel to one another.
- FIG. 28 illustrates the next step in which a ridge pattern is provided on the superior and inferior surfaces 114 and 16 with a concentric-arc ridge cutter (not shown).
- ridges are cut into the superior and inferior surfaces of the stabilizing fins 120 (as shown in FIGS. 21–24 ).
- the ridges of the stabilizing fins 120 generally extend in a medial-lateral direction.
- the implant 110 has as depth, a width, an anterior height, and a posterior height.
- the depth ranges from approximately 14 mm to approximately 27 mm and the width W ranges from approximately 8 mm to 15 mm.
- the anterior height, including the stabilizing fins 120 ranges from 7 mm to 28 mm and the posterior height ranges from 5 mm to 18 mm.
- FIGS. 29–32 an exemplary use application for the implant 110 will be described.
- a pair of implants 110 are shown surgically inserted between adjacent vertebrae V to reestablish a normal gap therebetween.
- the implants 110 are shown such that the stabilizing fins 120 are positioned on the lateral sides of the implant 110 .
- the stabilizing fins 120 are disposed in corresponding grooves 126 provided in the end plate of the adjacent vertebrae.
- an implant constructed according to the teachings of a ninth preferred embodiment of the present invention is generally identified at reference character 200 .
- the implant 200 of the second preferred embodiment is identical to the implant 110 of the eighth preferred embodiment with the exception that the superior and inferior portions of the stabilizing fins are oriented at a lordodic angle of approximately 6°.
- an allograft spinal implant constructed in accordance with the teachings of a tenth preferred embodiment of the present invention is illustrated and generally identified at reference character 210 .
- the implant 210 is particularly intended for posterior lumber interbody fusion.
- Arrow B indicates the long axis of the donor bone.
- the sides of the implant 210 are formed to include grooves 212 to facilitate insertion.
- Inferior and superior surfaces of the implant 212 are formed to include a plurality of concentric-arc ridges 214 .
- an allograft spinal implant constructed in accordance with the teachings of a eleventh preferred embodiment of the present invention is illustrated and generally identified at reference character 230 .
- the implant 230 is particularly intended for posterior lumber interbody fusion.
- the ridges 214 of the implant are only formed on a central strip.
- an allograft spinal implant constructed in accordance with the teachings of a twelfth preferred embodiment of the present invention is illustrated and generally identified at reference character 250 .
- the implant 250 is particularly intended for anterior lumbar interbody fusion applications.
- the long axis of the donor bone is indicated by arrow C.
- the implant 250 defines a generally central aperture 252 .
- the implant 250 is formed to include a plurality of concentric-arc ridges 254 on both the inferior and superior surfaces.
- the superior and inferior end faces are angled from one another at approximately 6°. However, it is anticipated that the lordodic angle may fall within the range of 0° to approximately 6° or greater than 6°
Abstract
Description
Claims (23)
Priority Applications (1)
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US10/225,090 US7018412B2 (en) | 2001-08-20 | 2002-08-20 | Allograft spinal implant |
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US31360201P | 2001-08-20 | 2001-08-20 | |
US31360001P | 2001-08-20 | 2001-08-20 | |
US10/225,090 US7018412B2 (en) | 2001-08-20 | 2002-08-20 | Allograft spinal implant |
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US20030069640A1 US20030069640A1 (en) | 2003-04-10 |
US7018412B2 true US7018412B2 (en) | 2006-03-28 |
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US10/225,090 Expired - Lifetime US7018412B2 (en) | 2001-08-20 | 2002-08-20 | Allograft spinal implant |
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